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Challenges of Large Converter-Fed Synchronous Machines for Variable-Speed Pumped Hydro Storage

Author

Listed:
  • Stefan Polster

    (Verbund Hydro Power GmbH, 1010 Vienna, Austria)

  • Johannes Deschler

    (Grenzkraftwerke GmbH, 84359 Simbach, Germany)

  • Herwig Renner

    (Institute of Electric Power Systems, Graz University of Technology, 8010 Graz, Austria)

  • Aurelie Bocquel

    (GE Power Conversion Berlin, 12277 Berlin, Germany)

  • Martin Janssen

    (GE Power Conversion Berlin, 12277 Berlin, Germany)

Abstract

The green energy transition of electrical energy production is leading to an increasing share of total energy production for volatile renewable energy sources, mainly wind and solar power. To handle this volatile production, flexible and efficient energy storage is required. The development of high-power converters has enabled the generation of variable-speed pumped hydro storage power plants, combining the so-far-unequalled energy storage capacity of classical pumped-storage hydro power plants and the recently increased operation requirements. The introduction of large-scale converters has led to new challenges in the overall design of power plant systems. This paper intended to take a closer look at a large-scale converter-fed synchronous generator, especially the distribution of the current and voltage harmonics caused by the converter in the implemented generation system. Thereby, holistic design considerations for an ideal loss distribution as well as possible measures to limit the effects of harmonic coupling at the generator shaft and bearings are discussed. Furthermore, basic considerations of harmonic emission to the connected network are described. These topics are addressed by analyzing on-site measurements at an 85 MVA converter-fed synchronous generator with a voltage source inverter, underpinned with the theoretical background.

Suggested Citation

  • Stefan Polster & Johannes Deschler & Herwig Renner & Aurelie Bocquel & Martin Janssen, 2023. "Challenges of Large Converter-Fed Synchronous Machines for Variable-Speed Pumped Hydro Storage," Energies, MDPI, vol. 16(22), pages 1-18, November.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:22:p:7506-:d:1277066
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    References listed on IDEAS

    as
    1. Hasan Akbari & Juan I. Pérez-Díaz & José-Ignacio Sarasúa & Robert Schürhuber, 2023. "Implementation and Evaluation of a Complex Pumped-Storage Hydropower Plant with Four Units, Common Penstock, and Surge Tank in a Real-Time Digital Simulator," Energies, MDPI, vol. 16(9), pages 1-23, April.
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